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25 April 2024 |
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On the nature of the compact sources in IRAS 16293-2422 seen in at centimeter to sub-millimeter wavelengths | | Antonio Hernández-Gómez
; Laurent Loinard
; Claire J. Chandler
; Luis F. Rodríguez
; Luis A. Zapata
; David J. Wilner
; Paul T.P. Ho
; Emmanuel Caux
; David Quénard
; Sandrine Bottinelli
; Crystal L. Brogan
; Lee Hartmann
; Karl M. Menten
; | | Date: |
6 Mar 2019 | | Abstract: | We present multi-epoch continuum observations of the Class 0 protostellar
system IRAS 16293-2422 taken with the Very Large Array (VLA) at multiple
wavelengths between 7 mm and 15 cm (41 GHz down to 2 GHz), as well as
single-epoch Atacama Large Millimeter/submillimeter Array (ALMA) continuum
observations covering the range from 0.4 to 1.3 mm (700 GHz down to 230 GHz).
The new VLA observations confirm that source A2 is a protostar driving episodic
mass ejections, and reveal the complex relative motion between A2 and A1. The
spectrum of component B can be described by a single power law ($S_
u propto
u^{2.28}$) over the entire range from 3 to 700 GHz (10 cm down to 0.4 mm),
suggesting that the emission is entirely dominated by dust even at $lambda$ =
10 cm. Finally, the size of source B appears to increase with frequency up to
41 GHz, remaining roughly constant (at $0’’.39$ $equiv$ 55 AU) at higher
frequencies. We interpret this as evidence that source B is a dusty structure
of finite size that becomes increasingly optically thick at higher frequencies
until, in the millimeter regime, the source becomes entirely optically thick.
The lack of excess free-free emission at long wavelengths, combined with the
absence of high-velocity molecular emission indicates that source B does not
drive a powerful outflow, and might indicate that source B is at a particularly
early stage of its evolution. | | Source: | arXiv, 1903.2202 | | Services: | Forum | Review | PDF | Favorites | |
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